[zlaski/what-buffer-function] Rename references to BufferFunction to ArrayFunction.

Author: zlaski-semmle

cpp/ql/src/semmle/code/cpp/models/interfaces/ArrayFunction.qll

@@ -1,9 +1,9 @@
 /**
  * Provides an abstract class for accurate modeling of input and output buffers
  * in library functions when source code is not available.  To use this QL
- * library, create a QL class extending `BufferFunction` with a characteristic
+ * library, create a QL class extending `ArrayFunction` with a characteristic
  * predicate that selects the function or set of functions you are trying to
- * model. Within that class, override the predicates provided by `BufferFunction`
+ * model. Within that class, override the predicates provided by `ArrayFunction`
  * to match the flow within that function.  Finally, add a private import
  * statement to `CustomModels.qll`
  */